C
HAPTER
44
| DHCP Commands
DHCP Relay Option 82
– 1390 –
client requests to a DHCP server. Up to five DHCP servers can be
specified in order of preference.
If any of the specified DHCP server addresses are not located in the
same network segment with this switch, use the ip default-gateway or
ipv6 default-gateway command to specify the default router through
which this switch can reach other IP subnetworks.
EXAMPLE
Console(config)#ip dhcp relay server 192.168.10.19
Console(config)#
ip dhcp relay
information option
This command enables DHCP Option 82 information relay, and specifies the
frame format to use for the remote-id when Option 82 information is
generated by the switch. Use the no form of this command to disable this
feature.
SYNTAX
ip dhcp relay information option
[encode no-subtype]
[remote-id {ip-address [encode {ascii | hex}] |
mac-address [encode {ascii | hex}] | string string}]
no ip dhcp rely information option [encode no-subtype]
[remote-id [ip-address encode] | [mac-address encode]]
encode no-subtype - Disables use of sub-type and sub-length
fields in circuit-ID (CID) and remote-ID (RID) in Option 82
information.
mac-address - Includes a MAC address field for the relay agent
(that is, the MAC address of the switch’s CPU).
ip-address - Includes the IP address field for the relay agent (that
is, the IP address of the management interface).
encode - Indicates encoding in ASCII or hexadecimal.
string - An arbitrary string inserted into the remote identifier field.
(Range: 1-32 characters)
DEFAULT SETTING
Option 82: Disabled
CID/RID sub-type: Enabled
Remote ID: MAC address
COMMAND MODE
Global Configuration
USAGE GUIDELINES
â—† Using this command with or without any keywords will enable DHCP
Option 82 information relay. You must also specify the IP address for at
least one active DHCP server (with the ip dhcp relay server command).
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